`Iron Man’ star Downey presents boy with bionic arm

LOS ANGELES — Just like Tony “Iron Man” Stark, Robert Downey Jr. is a part-time superhero – at least in the eyes of one seven-year-old boy.

In a video posted online Thursday, the actor, dressed as Stark, who becomes Iron Man in the movies, presents a working bionic prosthesis to seven-year-old Alex, who was born with a partially developed right arm.